英语作文:比较一下过去的大同和现在的大同有什么不同.用上used to和but now的句型.

i think Datong is very dirty.when i sat on somewhere ,i used to put a paper on there and then i could sat down and did something i like.
but now,Datong become very clean ,there is no anything dirty.there are many trees and flowers.and i can see o lot of bees and butterfly
it is realy a wondful sight.i like my home,and i belive strongly if you come here ,you will feel in love with it!